<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main"android:layout_width="match_parent" android:layout_height="match_parent"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"android:gravity="center_horizontal"tools:context="com.example.a7_.MainActivity"><com.example.a7_.MyView  android:layout_alignParentBottom="true"  android:id="@+id/mv"  android:background="@mipmap/lockviewbg"  android:layout_width="wrap_content"  android:layout_height="wrap_content" /></RelativeLayout>

package com.example.a7_;  import android.content.Context;  import android.graphics.Bitmap;  import android.graphics.BitmapFactory;  import android.graphics.Canvas;  import android.graphics.Paint;  import android.util.AttributeSet;  import android.util.Log;  import android.view.MotionEvent;  import android.view.View;  import android.widget.Scroller;  /**   * Created by Administrator on 2017.05.28.0028.   */  public class MyView extends View {  private final Bitmap slidBitmap;  private final Bitmap bgBitmap;  private int startx;  private int destance;  private float endx;  private final Scroller scroller;  public MyView(Context context, AttributeSet attrs) {    super(context, attrs);    //加載圖片資源    slidBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.switch_button);    bgBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.lockviewbg);    //創建scroller對象    scroller = new Scroller(context);  }  @Override  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {    //設置自定義控件的寬和高,,以背景圖片為標準    setMeasuredDimension(bgBitmap.getWidth(),bgBitmap.getHeight());  }  @Override  protected void onDraw(Canvas canvas) {    super.onDraw(canvas);    //繪制圖片    canvas.drawBitmap(slidBitmap,0,0,null);  }  //設置滑塊的觸摸事件  @Override  public boolean onTouchEvent(MotionEvent event) {    switch (event.getAction()){      case MotionEvent.ACTION_DOWN:        //當手指按下的時候,記錄坐標        startx = (int) event.getX();        break;      case MotionEvent.ACTION_MOVE:        //當手指移動的時候,記錄移動的距離        destance = (int)(event.getX()-startx);        //限制滑塊移動的區間        if (destance<0){          destance = 0;        }else if (destance>bgBitmap.getWidth()-slidBitmap.getWidth()){          destance = bgBitmap.getWidth()-slidBitmap.getWidth();        }        //將滑塊移動至該位置        scrollTo( -destance,0);        break;      case MotionEvent.ACTION_UP:        //當手指離開時,記錄手指離開的位置        if (destance<bgBitmap.getWidth()-slidBitmap.getWidth()){          //手指抬起時,如果滑塊不在右邊,那就讓他回到左邊          startx = destance;          int dx = 0-destance;          scroller.startScroll(startx,0,dx,0);          invalidate();        }else {          //開啟解鎖          listener.onUnlock(this);        }        break;    }    invalidate();    return true;  }  //重寫computeScroll方法 調用invalidate之后 會調用draw draw會調用到這個computeScroll  @Override  public void computeScroll() {    if (scroller.computeScrollOffset()){      //獲取滑塊當前的位置      int currx = scroller.getCurrX();      scrollTo(-currx,0);      //重新繪制      invalidate();    }  }  //設置一個解鎖的接口  interface onUnLockListener{    void onUnlock(MyView view);  }  private onUnLockListener listener;  public void setOnLockListener(onUnLockListener listener){      this.listener = listener;  }  }##核心代碼  package com.example.a7_;  import android.support.v7.app.AppCompatActivity;  import android.os.Bundle;  public class MainActivity extends AppCompatActivity {  private MyView myView;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    //初始化控件    myView = (MyView) findViewById(R.id.mv);    //設置監聽事件    myView.setOnLockListener(new MyView.onUnLockListener() {      @Override      public void onUnlock(MyView view) {        //觸發監聽,結束頁面        finish();      }    });  }  }